计及功率耦合影响的虚拟同步机有功传输特性分析  

Analysis of active power transmission characteristics of virtual synchronous generator considering the effect of power coupling

作　　者：范鎏洋 马玉梅[2] 陈仲伟 郭祥 朱东海[2] 邹旭东[2] FAN Liuyang;MA Yumei;CHEN Zhongwei;GUO Xiang;ZHU Donghai;ZOU Xudong(China-EU Institute for Clean and Renewable Energy,Huazhong University of Science&Technology,Wuhan 430074,China;Power Electronics and Energy Management Key Laboratory of Ministry of Education of China,Huazhong University of Science&Technology,Wuhan 430074,China;Economic&Technical Research Institute,State Grid Hunan Electric Power Company Limited,Changsha 410000,China)

机构地区：[1]华中科技大学中欧清洁与可再生能源学院,湖北武汉430074 [2]华中科技大学电力电子与能量管理教育部重点实验室,湖北武汉430074 [3]国网湖南省电力有限公司经济技术研究院,湖南长沙410000

出　　处：《武汉大学学报（工学版）》2023年第1期89-97,共9页Engineering Journal of Wuhan University

基　　金：国家电网公司总部科技项目;国家电网-华中科技大学未来电网研究院项目(编号:5100-202199549A-0-5-ZN)。

摘　　要：虚拟同步机(virtual synchronous generator,VSG)因能够提高新能源发电系统主动支撑电网的能力,得到了广泛应用。然而,随着新能源比例的升高,电网强度逐渐降低,系统的稳定性可能因VSG传输的有功功率超过其有功传输极限而受到不利影响。忽略功率耦合因素影响将给VSG的有功传输极限分析带来一定的误差。为了解决这一问题,首先建立了VSG的基本模型,并基于所建模型再次强调了有功传输极限与功角稳定性的关系。然后针对不考虑和考虑功率耦合影响2种场景,分别分析了线路阻抗角、功率因数角对VSG有功传输极限的影响规律,分析结果表明:不考虑功率耦合时,增大线路中阻性成分可以提高VSG的有功传输极限,而考虑功率耦合时,VSG发出一定的无功功率可以增大其有功传输极限,若VSG吸收无功功率则会起到相反的效果。最后通过Matlab/Simulink仿真验证了理论分析的正确性。Virtual synchronous generator(VSG) has been widely used because it can improve the ability of the new energy power generation system to actively support the power grid. However, as the proportion of new energy increases, the power grid strength gradually decreases, and the stability of the system may be adversely affected because the active power transmitted by VSG exceeds its active power transmission limit. When the influence of power coupling factor is ignored, some errors will be brought to the analysis of the active power transmission limit of VSG. In order to solve this problem, the basic model of VSG was established first, and based on the model the relationship between the active transmission limit and power angle stability was once again stressed. Then, the influence laws of line impedance angle and power factor angle on VSG active power transmission limit were analyzed respectively for two scenarios, with/without considering power coupling influence. The analysis results show that without considering the power coupling, increasing the resistive component in the line can improve the active power transmission limit of VSG. When considering the power coupling, the reactive power emitted by VSG can increase its active power transmission limit. If the reactive power is absorbed by VSG, the opposite effect will occur. Finally, the correctness of the theoretical analysis is verified by Matlab/Simulink simulation.

关 键 词：有功传输极限 虚拟同步机 线路阻抗 无功功率 功率耦合 影响因素 

分 类 号：TM7[电气工程—电力系统及自动化]